Production of wood wool



March 23, 1937. M,LEDERER` 2,074,590

PRODUCTION OF WOOD WOOL F'ileanec. 4, 1935 ,S2132 mk l wird -,lbe u y ad Aff] Patented Mar. 2 3, 1937 I l "s UNITED STATI-:s

2,074,590 PRODUCTION oF woon wooll Maximilian Lederer, Split, Yugoslavia, assignor` to n Alexander Singer, Vienna, Austria 1 Application December 4, 1935, serial No. 52,822

f In Yugoslavia May 3, 1935 4 Claims.

My invention relates to the production of building material and more especially to products adapted for the building up of wall structures including blocks, boards, panels and slabs con- 5 sisting of a mixture of wood4 wool and cement. It has particular reference to the production Iof wall products of the kind aforesaid which consists of a mixture of wood wool and Portland cement.

lo Wall products made of such a mixture of wood wool and cement have already been produced and to this end the wood wool has been subjected to an impregnation treatment before being mixed with the cement. This preliminary treatment entails considerable expense. i

I vhave now found Ithat it is possible to combine and mix the wood wool with the cement in a very easy and efficient manner without previous impregnation by first treating the wood with steam and thereafter mixing it with the cement.

If the steam treatment is applied to the wood wool, the boiler space required vfor this treatment is excessive, since the wood wool is very voluminous. I have however foundthat the problem of pretreating the wood with steam can besolved` in a very economical manner by combining it with the known removal of acetic acid, acetone,l

resin and the like with the aid of steam from the logs which serve asraw material in the production of the wood wool.

By applying the treatment with steam to the logs or other wood material serving subsequently to produce wood wool I avoid the expenditure for the erection of special boiler plants and Igreatlytreatment and the space with waste steam under a pressureof about-.5'

'atmosphere above normal. I prefer acting in this manner with steam on block or round wood having a length of approximately .5 metre and to assist the action of the steam by simultaneously spraying into the steam chamber neutrallead acetate which in mixing with the steam considerably increases and accelerates the impregnating` action.

The logs or blocks of wood thus pretreated are then converted into wood wool in the usual manner. 4\

In the drawing amxed to this specification and ,forming part thereof an apparatus adapted for the carrying out of my invention is illustrated diagrammatically by way of example in vertical section.

In the drawing, l is the brick or-cement wall of the steam chamber and 2 is the sloping bottom of the chamber, from which liquid can flow 5 through openings 3 into the exhaust conduit 4. 5 isv a lattice bottom for supporting the material pressure of about 1.5 atmospheres mixes with 15 the solution of neutral acetate of. lead supplied through pipe l and spray nozzle 8, the solution being finely distributed in the steam before coming in contact with the wood.

After the combined action of the steam and 2o the acetate of lead has been allowed to continue for a while, the wood thus treated is withdrawn from the steam chamber and is nowI converted into wood wool in a well known manner. The wood wool thus produced has been found to be 25 excellently suited for the combination with cement and the building blocks or other wall material produced from such a'mixture have been found to possess excellent properties.

Various changes may be made in the details 30 disclosed in the foregoing specification without departing from the invention or sacrificing the advantages thereof.

In the claims aiilxed .to this specification no selection of any particular modification of .the f invention is intended to the exclusion of other modifications thereof and thel right to subsequently make claim in the present application to any modification not covered by these claims is expressly reserved. 40 I claim: 1. In the production of wood wool adapted for use in the manufacture of wall products formed of a mixture of wood wool and cement the step of pretreating the wood, before it is converted into wood wool, with steam under a pressure slightly above normal pressure. v f

2. Inl the production `of wood wool adapted for use in the manufactureof wall products formed of a mixture of Wood wool and cement the step of acting on the wood with a mixture of steam under a pressure slightly above normal and neutral acetate of lead. 3.. The processor producing wood wool which comprises acting on wood with a mixture of steam under slight pressure above normal and with Aacetate of lead and converting the wood thus treated into wood wool. l

4. Wood woolcontaining acetate of lead.

MAXIMILIAN ILIIEDIEIRER.v 60 

